[Bug 1874469] [NEW] [SRU] update-manger intermittently hangs during snap updates

[Marcus Tomlinson]

Public bug reported:

[Impact]

Every so often update-manager can hang during snap updates. When this
occurs the application must be force closed.

[Test Case]

Repeating the following will eventually cause a hang on "Installing
snap-store snap".

`
sudo apt -y install gnome-software
sudo apt-mark auto gnome-software

snap remove snap-store
rm -rf ~/snap/snap-store

update-manager
`

[Regression Potential]

The fix is trivial (see linked branch), in fact, GLib.idle_add() was
applied correctly elsewhere, it was just missed here.

** Affects: update-manager (Ubuntu)
     Importance: High
     Assignee: Marcus Tomlinson (marcustomlinson)
         Status: In Progress

** Affects: update-manager (Ubuntu Focal)
     Importance: High
     Assignee: Marcus Tomlinson (marcustomlinson)
         Status: In Progress

** Changed in: update-manager (Ubuntu)
       Status: New => In Progress

** Changed in: update-manager (Ubuntu)
     Assignee: (unassigned) => Marcus Tomlinson (marcustomlinson)

** Changed in: update-manager (Ubuntu)
   Importance: Undecided => High

** Branch linked: lp:~marcustomlinson/update-manager/update-manager

** Also affects: update-manager (Ubuntu Focal)
   Importance: High
     Assignee: Marcus Tomlinson (marcustomlinson)
       Status: In Progress

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https://bugs.launchpad.net/bugs/1874469

Title:
  [SRU] update-manger intermittently hangs during snap updates

Status in update-manager package in Ubuntu:
  In Progress
Status in update-manager source package in Focal:
  In Progress

Bug description:
  [Impact]

  Every so often update-manager can hang during snap updates. When this
  occurs the application must be force closed.

  [Test Case]

  Repeating the following will eventually cause a hang on "Installing
  snap-store snap".

  `
  sudo apt -y install gnome-software
  sudo apt-mark auto gnome-software

  snap remove snap-store
  rm -rf ~/snap/snap-store

  update-manager
  `

  [Regression Potential]

  The fix is trivial (see linked branch), in fact, GLib.idle_add() was
  applied correctly elsewhere, it was just missed here.

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